field-magnet

field magnet

noun
a magnet for producing a magnetic field, as in a particle accelerator or an electric motor.

Origin:
1880–85

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
field magnet
 
n
a permanent magnet or an electromagnet that produces the magnetic field in a generator, electric motor, or similar device

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
field magnet  
A permanent magnet used to produce a base magnetic field against which other magnetized materials react, as in the operation of electrical devices such as motors, generators, and solenoids.
The American Heritage® Science Dictionary
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